From: Kay Sievers <kay@vrfy.org>
Date: Tue, 20 Nov 2012 17:10:45 +0000 (+0100)
Subject: udev: net - add device naming properties
X-Git-Tag: v196~19
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=commitdiff_plain;h=d23965a64eb5c2c97b839dc2e3e79fc1613994f1

udev: net - add device naming properties
---

diff --git a/src/udev/udev-builtin-net_id.c b/src/udev/udev-builtin-net_id.c
index eff455277..72237bf31 100644
--- a/src/udev/udev-builtin-net_id.c
+++ b/src/udev/udev-builtin-net_id.c
@@ -17,6 +17,17 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+/*
+ * eno<index> -- ethernet on-board
+ * ID_NET_NAME_FIRMWARE=eno1
+ *
+ * enp<pci bus number>s<slot>f<function> -- physical location/path
+ * ID_NET_NAME_PATH=enp19s0f0
+ *
+ * enm<MAC address> -- MAC address
+ * ID_NET_NAME_MAC=enxf0def180d479
+ */
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>
@@ -26,25 +37,110 @@
 
 #include "udev.h"
 
-/* IEEE Organizationally Unique Identifier */
-static int lookup_OUI(struct udev_device *dev, bool test) {
-        const char *addr;
-        unsigned int a1, a2, a3;
-        char oui[16];
+static int dev_pci(struct udev_device *dev, const char *prefix, bool test) {
+        struct udev_device *d;
+        unsigned int bus;
+        unsigned int slot;
+        unsigned int func;
+        const char *index;
+        int err;
 
-        addr = udev_device_get_sysattr_value(dev, "address");
-        if (!addr)
+        /* skip other buses than direct PCI parents */
+        d = udev_device_get_parent(dev);
+        if (!d || !streq("pci", udev_device_get_subsystem(d)))
                 return -ENOENT;
 
-        if (sscanf(addr, "%x:%x:%x:", &a1, &a2, &a3) != 3)
+        /* find SMBIOS type 41 entries for on-board devices */
+        index = udev_device_get_sysattr_value(d, "index");
+        if (index) {
+                unsigned int idx;
+
+                idx = strtoul(index, NULL, 0);
+                if (idx > 0) {
+                        const char *label;
+                        char s[16];
+
+                        snprintf(s, sizeof(s), "%so%d", prefix, idx);
+                        udev_builtin_add_property(dev, test, "ID_NET_NAME_FIRMWARE", s);
+
+                        label = udev_device_get_sysattr_value(d, "label");
+                        if (label)
+                                udev_builtin_add_property(dev, test, "ID_NET_LABEL_FIRMWARE", label);
+                }
+        }
+
+        /* compose a name based on the PCI bus location */
+        if (sscanf(udev_device_get_sysname(d), "0000:%x:%x.%d", &bus, &slot, &func) == 3) {
+                char str[16];
+
+                snprintf(str, sizeof(str), "%sp%ds%df%d", prefix, bus, slot, func);
+                err = udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
+                if (err < 0)
+                        return err;
+        }
+        return 0;
+}
+
+static int dev_mac(struct udev_device *dev, const char *prefix, bool test) {
+        const char *s;
+        unsigned int i;
+        unsigned int a1, a2, a3, a4, a5, a6;
+        char str[16];
+        int err;
+
+        /* check for NET_ADDR_PERM, skip random MAC addresses */
+        s = udev_device_get_sysattr_value(dev, "addr_assign_type");
+        if (!s)
+                return EXIT_FAILURE;
+        i = strtoul(s, NULL, 0);
+        if (i != 0)
+                return 0;
+
+        s = udev_device_get_sysattr_value(dev, "address");
+        if (!s)
+                return -ENOENT;
+        if (sscanf(s, "%x:%x:%x:%x:%x:%x", &a1, &a2, &a3, &a4, &a5, &a6) != 6)
+                return -EINVAL;
+
+        /* skip empty MAC addresses */
+        if (a1 + a2 + a3 + a4 + a5 + a6 == 0)
                 return -EINVAL;
 
-        snprintf(oui, sizeof(oui), "OUI:%X%X%X", a1, a2, a3);
-        return udev_builtin_hwdb_lookup(dev, oui, test);
+        /* add IEEE Organizationally Unique Identifier */
+        snprintf(str, sizeof(str), "OUI:%X%X%X", a1, a2, a3);
+        udev_builtin_hwdb_lookup(dev, str, test);
+
+        snprintf(str, sizeof(str), "%sx%x%x%x%x%x%x", prefix, a1, a2, a3, a4, a5, a6);
+        err = udev_builtin_add_property(dev, test, "ID_NET_NAME_MAC", str);
+        if (err < 0)
+                return err;
+        return 0;
 }
 
 static int builtin_net_id(struct udev_device *dev, int argc, char *argv[], bool test) {
-        lookup_OUI(dev, test);
+        const char *s;
+        unsigned int i;
+        const char *devtype;
+        const char *prefix = "en";
+
+        /* handle only ARPHRD_ETHER devices */
+        s = udev_device_get_sysattr_value(dev, "type");
+        if (!s)
+                return EXIT_FAILURE;
+        i = strtoul(s, NULL, 0);
+        if (i != 1)
+                return 0;
+
+        devtype = udev_device_get_devtype(dev);
+        if (devtype) {
+                if (streq("wlan", devtype))
+                        prefix = "wl";
+                else if (streq("wwan", devtype))
+                        prefix = "ww";
+        }
+
+        dev_pci(dev, prefix, test);
+        dev_mac(dev, prefix, test);
         return EXIT_SUCCESS;
 }